Influences of superplasticizers on the basic and drying creep of concrete

Qian, Chunxiang; Zhang, Yi; Huang, Haoliang; Qu, Jun; Guo, Jingqiang

doi:10.1002/suco.201500185

Cited by 17 publications

(13 citation statements)

References 10 publications

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“…The mean relative humidity for C60 concrete is the average value of the test results shown in Figure 4. Moreover, the mean relative humidity for C80 is assumed to 90% because the surfaces of the testing member are covered by wax (Qian 2016). Average thickness h is used for all models expect ACI209 model (ACI209 R-92, 1992).…”

Section: Comparison Of Existing Modelsmentioning

confidence: 99%

Creep Characteristics Of Concrete Used In Long-Span Arch Bridge

Wang

Zhao

Jia

et al. 2019

BJRBE

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The reinforced concrete arch bridge with concrete-filled steel tubular stiffened skeleton is extensively used in the mountainous area of southwest China due to their long span and high stability. Beibanjiang Bridge located in Shanghai- Kunming high-speed railway, which had a record span of 445 m, has recently been completed in 2016. However, concrete creep and shrinkage have pronounced effects on the long-term deflection and stress redistribution of this bridge. Several concrete creep and shrinkage specimens in the natural environment were made to predict the long-term behaviour of this bridge accurately. They were used to measure the concrete creep and shrinkage of the core concrete and surrounding concrete used in the arch bridge. The test results were compared to ACI209 R-92 Prediction of Creep, Shrinkage and Temperature Effects in Concrete Structures model, 1990 CEB-FIP Model Code 1990: Design Code model, fib Model Code for Concrete Structures 2010 model and Creep and Shrinkage Prediction Model for Analysis and Design of Concrete Structures-Model B3. Based on the numerical fitting method, the fib Model Code for Concrete Structures 2010 model was modified to suit the concrete creep and shrinkage experimental results. Then, the modified fib Model Code for Concrete Structures 2010 model was used to predict the timedependent behaviour of a concrete arch bridge.

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Section: Comparison Of Existing Modelsmentioning

confidence: 99%

Creep Characteristics Of Concrete Used In Long-Span Arch Bridge

Wang

Zhao

Jia

et al. 2019

BJRBE

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“…Many factors affect the durability of concrete, such as reinforcement corrosion, freeze–thaw cycles, concrete carbonization, and chloride ion erosion, which are directly influenced by moisture transportation . Absorption is one of the key mechanisms of moisture transportation in cement‐based materials and is closely related to pore structure . The pores of cement‐based materials mainly include gel pores and capillary pores, according to the pore system .…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Zhao

Ding

Huang

et al. 2019

Structural Concrete

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Capillary absorption capacity has an important influence on the durability of concrete and is closely related to pore structure. In this study, the pore structure and capillary water absorption of samples were determined by low-field nuclear magnetic resonance spectroscopy and the gravimetric method, respectively. The test results show that the most probable pore diameter and equivalent pore diameter of cement-based materials increase with increasing water to cement ratio (w/c) and fly ash (FA) content and decrease with increasing curing age and cement to sand ratio (c/s). The porosity of cement-based materials increases with increasing w/c and c/s, decreases with increasing curing age, and first decreases and then increases with increasing FA content. The curves for the amount of capillary water absorption per unit area in specimens with the square root of time for cement-based material under different influence factors are similar and show obvious linear and stable stages.The capillary absorption coefficient is nearly linearly related to w/c or c/s, and nonlinearly related to curing age or FA content, observation that are well correlated with the porosity and square root of the equivalent pore radius. A modified model is proposed for the capillary absorption coefficient with consideration of the pore structure, and the theoretical results of the model are in good agreement with the test results. K E Y W O R D Scapillary absorption coefficient, cement-based materials, equivalent pore radius, low-field nuclear magnetic resonance spectroscopy, modified model, porosity Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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“…Table also shows that the values of Slump flow diameter and H f/ H i ratio increase with the increase of the superplasticizer amount. This improvement of the rheological properties is due to the release of the water between cement particles and to the increase of the water films coating the mixture particles …”

Section: Resultsmentioning

confidence: 99%

Rheological characterization of self‐compacting concrete: New recommendation

Benaicha

Belcaid²,

Alaoui³

et al. 2019

Structural Concrete

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The most commonly used test to characterize the fluidity of self-compacting concretes (SCC) is the Abrams cone spreading. However, this later, according to many scientific studies, contains some defects depending on the operator and the analysis of the found results. Further, the use of a concrete rheometer on building site is a very complex operation. In this regard, our laboratory has developed another practical, simple, and economical test able to measure, on building site, the plastic viscosity and the yield stress of the SCC. This is a "V-Funnel coupled to a horizontal Plexiglas channel" test. The experimental results of our study show that the proposed tool can replace the LCPC-box test, the concrete rheometer and other empirical tests recommended by the European standards. K E Y W O R D S plastic viscosity,

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Influences of superplasticizers on the basic and drying creep of concrete

Cited by 17 publications

References 10 publications

Creep Characteristics Of Concrete Used In Long-Span Arch Bridge

Creep Characteristics Of Concrete Used In Long-Span Arch Bridge

Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials

Rheological characterization of self‐compacting concrete: New recommendation

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